IPv6: Configuring Route Filtering RIPng:

IPv6: Configuring Route Filtering RIPng:

 ·         Let me configure RIPng between 2 routers:

R1----fa0/0-------------------fa0/0-----R2

2001:12::1----------------------2001:12::2

      ·         R1’s Loopback0: 2001:1::1

·         R2’s loopback0: 2001:2::2

·         R2’s loopback1: 2001:22::22

 

R1(config)#ipv6 router rip RIPng

 

R1(config-if)#do show run int fa0/0

Building configuration...

 

Current configuration : 137 bytes

!

interface FastEthernet0/0

 no ip address

 duplex auto

 speed auto

 ipv6 address 2001:12::1/64

 ipv6 enable

 ipv6 rip RIPng enable

end

 

R1(config-if)#do show run int loop0

Building configuration...

 

Current configuration : 92 bytes

!

interface Loopback0

 no ip address

 ipv6 address 2001:1::1/64

 ipv6 rip RIPng enable

end

 

R1(config-if)#

 

R2(config)#ipv6 router rip RIPng

 

R2#show run int fa0/0

Building configuration...

 

Current configuration : 137 bytes

!

interface FastEthernet0/0

 no ip address

 duplex auto

 speed auto

 ipv6 address 2001:12::2/64

 ipv6 enable

 ipv6 rip RIPng enable

end

 

R2#show run int loop0

Building configuration...

 

Current configuration : 92 bytes

!

interface Loopback0

 no ip address

 ipv6 address 2001:2::2/64

 ipv6 rip RIPng enable

end

 

R2#

 

R2(config-if)#do show run int loop1

Building configuration...

 

Current configuration : 94 bytes

!

interface Loopback1

 no ip address

 ipv6 address 2001:22::22/64

 ipv6 rip RIPng enable

end

 

R2(config-if)#

 

R1(config-rtr)#do show ipv6 rou

IPv6 Routing Table - 8 entries

Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP

       U - Per-user Static route

       I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary

       O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2

       ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2

C   2001:1::/64 [0/0]

     via ::, Loopback0

L   2001:1::1/128 [0/0]

     via ::, Loopback0

R   2001:2::/64 [120/2]

     via FE80::C001:25FF:FE30:0, FastEthernet0/0

C   2001:12::/64 [0/0]

     via ::, FastEthernet0/0

L   2001:12::1/128 [0/0]

     via ::, FastEthernet0/0

R   2001:22::/64 [120/2]

     via FE80::C001:25FF:FE30:0, FastEthernet0/0

L   FE80::/10 [0/0]

     via ::, Null0

L   FF00::/8 [0/0]

     via ::, Null0

R1(config-rtr)#

 

R2(config-if)#do show ipv6 route

IPv6 Routing Table - 9 entries

Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP

       U - Per-user Static route

       I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary

       O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2

       ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2

R   2001:1::/64 [120/2]

     via FE80::C000:25FF:FE30:0, FastEthernet0/0

C   2001:2::/64 [0/0]

     via ::, Loopback0

L   2001:2::2/128 [0/0]

     via ::, Loopback0

C   2001:12::/64 [0/0]

     via ::, FastEthernet0/0

L   2001:12::2/128 [0/0]

     via ::, FastEthernet0/0

C   2001:22::/64 [0/0]

     via ::, Loopback1

L   2001:22::22/128 [0/0]

     via ::, Loopback1

L   FE80::/10 [0/0]

     via ::, Null0

L   FF00::/8 [0/0]

     via ::, Null0

R2(config-if)#

 

Observations:

·         RIPng is configured between R1 and R2

·         R1 has advertised its loopback0 2001:1::1 into RIPng

·         R2 has advertised its loopback0 2001:2::2 into RIPng

·         R2 has advertised its loopback1 2001:22::22 into RIPng

 

·         Now, let me filter 2001:22::22 route from R1:

 

 

R1(config)#ipv6 router rip RIPng

R1(config-rtr)# distribute-list prefix-list LOOP-R2 in fastEthernet 0/0 R1(config)#ipv6 prefix-list LOOP-R2 permit 2001:2::2/64

R1(config)#

 

R1(config-rtr)#do show ipv6 route

IPv6 Routing Table - 7 entries

Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP

       U - Per-user Static route

       I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary

       O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2

       ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2

C   2001:1::/64 [0/0]

     via ::, Loopback0

L   2001:1::1/128 [0/0]

     via ::, Loopback0

R   2001:2::/64 [120/2]

     via FE80::C001:25FF:FE30:0, FastEthernet0/0

C   2001:12::/64 [0/0]

     via ::, FastEthernet0/0

L   2001:12::1/128 [0/0]

     via ::, FastEthernet0/0

L   FE80::/10 [0/0]

     via ::, Null0

L   FF00::/8 [0/0]

     via ::, Null0

R1(config-rtr)#

 

Observation:

·         2001:22::22 route is filtered from R1 now.

·         Prefix-list just matched the route that is allowed, i.e. permit 2001:2::2

 

·         Let me configure the same thing in a different way, by changing the prefix-list

 

R1(config-rtr)#no ipv6 prefix-list LOOP-R2 seq 5 permit 2001:2::/64

R1(config)#ipv6 prefix-list LOOP-R2 seq 5 deny 2001:22::/64

R1(config)#ipv6 prefix-list LOOP-R2 seq 10 permit ::/0 le 128

R1(config)#

 

Observation:

·         I have denied the route 2001:22::/64 and permitted everything else

·         Let me check the routing table of R1 if its working

 

R1(config)#do show ipv6 route

IPv6 Routing Table - 7 entries

Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP

       U - Per-user Static route

       I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary

       O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2

       ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2

C   2001:1::/64 [0/0]

     via ::, Loopback0

L   2001:1::1/128 [0/0]

     via ::, Loopback0

R   2001:2::/64 [120/2]

     via FE80::C001:25FF:FE30:0, FastEthernet0/0

C   2001:12::/64 [0/0]

     via ::, FastEthernet0/0

L   2001:12::1/128 [0/0]

     via ::, FastEthernet0/0

L   FE80::/10 [0/0]

     via ::, Null0

L   FF00::/8 [0/0]

     via ::, Null0

R1(config)#

 

Observation:

·         2001:22::22 route is filtered from R1 now.